Thesis Paper Zhuo Li

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The Impact of Star Power and Team Quality on NBA Attendance
THESIS
Presented in Partial Fulfillment of the Requirements for the Honors Research Distinction
in the Fisher College of Business at The Ohio State University
By
Zhuo Li
Undergraduate Program in Finance
The Ohio State University
Fisher College of Business
2018
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Copyrighted By
Zhuo Li
2018
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Abstract
As data analytics has improved rapidly in the past decade, sports analytics is playing
a more crucial role in the sports industry. Professional sports leagues like the NBA and
MLB have utilized on-field analytics to improve the performance of teams and players.
At the same time, team managers use off-field analytics to gain insights on the business
side. As a direct indicator of ticket sales, attendance is an important area to study. Many
factors affect attendance, but the influence brought by each factor is different. The
purpose of this research is to show the impact of star power and team quality on NBA
attendance, as well as to determine whether superstar presence or a championship caliber
team (or both) drives NBA attendance. The dataset includes attendance data of all NBA
teams in the past two seasons (2015-2016 and 2016-2017 seasons). NBA teams are
separated into four groups for this research: the high-level team (playoff team) with at
least one superstar, the high-level team with no superstars, the low-level team (nonplayoff team) with at least one superstar, and the low-level team with no superstars. Each
group is tested separately in order to find any differences in attendance. Descriptive
analysis results suggest that even a single visiting superstar will increase attendance, and
this effect is larger for low-level teams. Moreover, when a team has high attendance
variability, the effect of one or more visiting superstars is even larger. Regression models
are utilized to find the correlation between star power, team quality, and attendance. Two
separate regression models of star power and team quality are tested first in this research,
and the results show that both star power and team quality have a significant impact on
NBA attendance. However, when the superstar and high-level team are combined
together, the high-level team with at least one superstar drives attendance, and the high-
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level team without superstars doesn’t attract more audience. After analyzing the impact
of star power and team quality on NBA attendance, NBA team managers can make
specific and targeted marketing strategies to increase ticket sales.
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Acknowledgments
I sincerely thank Dr. Draper for being my research advisor and Dr. Bailey for leading the
Honors Contract program. Both have provided me with support and guidance throughout the
entire research process.
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Vita
May 2014 Jinan Foreign Language School
May 2018 B.S.B.A. Finance, The Ohio State University
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Table of Contents
I.
Title Page………………………………………………………………………….......1
II. Copyright Page………………………………………………………………………..2
III. Abstract………………………………………………………………………………. 3
IV. Acknowledgments…………………………………………………………………….5
V. Vita……………………………………………………………………………………6
VI. Table of Contents……………………………………………………………………..7
VII. Introduction………………………………………………………………………....8
VIII. Literature Review……………………………………………………………….....10
IX. Primary Hypothesis………………………………………………………………...13
X. Methodology………………………………………………………………………...15
a. Data Collection
b. Data Analysis
XI. Results……………………………………………………………………………….18
XII. Discussion………………………………………………………………………….25
XIII. Limitations and Further Research………………………………………………….27
XIV. Appendix………………………………………………………………………...... 29
XV. References………………………………………………………………………… 30
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Introduction
The NBA signed 9-year, $24 billion TV deals with ESPN and Turner in 2014. This
contract was a little bit surprising at first. The NBA league and players knew the value of the
new contract would be higher, but they didn’t anticipate that the deal would be increased so
much. On the other hand, this unexpected deal shows the league’s growing popularity. In other
words, TV broadcasters are positive about the profit brought by the NBA league in the next
decade. The NBA league has put a lot of effort in popularizing their stars. To a certain extent,
TV broadcasters have high expectation that those stars have good performance on the court, and
TV broadcasters want to attract more audience watching games on TV.
Except for the people before TV, the audience in the stadium is also very important to the
NBA. The increasing popularity of the NBA has proven the success of the league’s marketing
strategy. This research wants to help team managers utilize the growing popularity of the NBA
by studying the impact of NBA stars on attracting the audience in the stadium, which could be
measured by attendance. On average, ticket sales take about 25% of a basketball team’s total
revenue. Most of the time, high attendance means high gate revenues. If a stadium has high
attendance, it attracts more advertisements and cooperation from other companies. On the other
hand, people tend to believe that the quality of the game is another crucial factor attracting fans
to buy tickets. In other words, a game involving high-level teams would increase the number of
audiences.
In order to show the impact of star power and team quality on attendance prominently,
this research pays particular attention to the teams with high attendance variability. This research
will also consider other factors affecting attendance including the day of week and game time. In
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the end, this study will give management teams some business insights about how to increase
attendance and revenues.
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Literature Review
Metcalfe (2013) wanted to find a relationship between a star player on one team and their
impact on attendance when they play in an away game. The result showed that there was a
significant difference when LeBron James and Kevin Garnett play in an away game, but there
was no significant difference when Chris Paul and Carmelo Anthony play. There were some
limitations in Metcalfe’s study. First, the sample size was small. Metcalfe only included 4
superstars in his research, and the data was collected from one season. Second, Metcalfe just
tested games which occur on the weekend. In order to draw a convincing conclusion, 10
superstars and the data of two consecutive seasons were tested in this research. Weekdays and
weekends were important control variables in regression models.
Hausman and Leonard (1997) conducted a research showing that the NBA superstars had
a big influence on television ratings, and they also saw the value of superstars to other teams.
Hausman and Leonard’s research inspired me to examine the impact brought by away team’s
superstars on attendance since home team’s superstars don’t vary too much during a season.
Berri, Schmidt, and Brook (2004) examined the relationship between gate revenue and
both team performance and star attractions. By their test, Berri, Schmidt, and Brook found that
star power was statistically significant, but the consumer demand was more based on the team
performance. Berri, Schmidt, Brook’s research showed that both star power and team
performance of home team affected gate revenue, but this research examined the impact brought
by visiting superstars and team quality of visiting teams.
Shih and Chung (2012) conducted their research about fan loyalty. This research
suggested that sports team should put more effort in building team identification rather than
attracting star players. In other words, based on their research, the team as a whole was more
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important to attract fans rather than an individual star player. The study conducted by Shih and
Chung was not about the NBA. Stars in a basketball team are more crucial comparing other
sports, so this research is different from Shih and Chung’s research by paying particular attention
to basketball and analyzing how fans perceive basketball.
Berri and Schmidt (2001) used both a time-series analysis and a panel data set to verify
that league competitive balance had a significant impact on league attendance, but in another
research conducted by Berri and Schmidt (2004), they found a lack of competitive balance in the
NBA, which means competitive balance would be a minor factor for attendance in the NBA.
Berri and Schmidt (2006) suggested that superstar externality had an impact on road
attendance. Berri and Schmidt found that the finding was consistent with their previous work that
team performance plays a more important role in attendance. By their research, Berri and
Schmidt said that star power was more important to a team’s opponent. Berri and Schmidt
previous work focused on the impact of the home team on attendance. In addition, Berri and
Schmidt’s research was conducted in 2006. As the popularity of the NBA has increased in the
past decade, the impact of star power might be different from the influence in 2006.
Berri and Schmidt (2006) claimed that baseball fans no longer treated baseball as a
simple pastime. Recently, baseball fans regarded baseball as a business. In this research, authors
said that the transition of perception of baseball also happens in other sports league, so fans’
perception of NBA would be an important factor for attendance.
Kahane and Shmanske (1997) found that attendance was negatively related to team
turnover. Besides star power, team identification, team performance, and competitive balance,
team roster turnover is another important factor to consider. In this research, data from two
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consecutive seasons were tested in order to diminish the influence brought by team roster
turnover.
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Primary Hypothesis
The primary hypothesis of this study was that star power and team performance have a
significant influence on road attendance. The study focused on road attendance because the
number of stars and team quality of the home team didn’t vary too much during the season. The
impact of star power and team performance brought by the away team is more important to
study. This study examined that how attendance varies when the home team plays against the
away team with and without superstars. This study also analyzed the difference in attendance
when the home team plays against a high-level team and the home team plays against a low-level
team.
There were several factors influencing attendance. Some major variables in this study
were the number of superstars in the game, the quality of the away team, and the attendance data
of each game. First, in order to count the number of superstars, the definition of the superstar
should be clarified. People hold different views in terms of the criteria used to define a superstar.
Considering the authority and professionalism of sports media, this study chose to use the NBA
players ranking list released by ESPN and Sports Illustrated before the beginning of each season.
The top 10 players who appear on both lists were considered as the superstars in this study. In
the 2016 season, the superstars were LeBron James, Kevin Durant, Anthony Davis, Stephan
Curry, James Harden, Chris Paul, Russell Westbrook, Blake Griffin, Marc Gasol, and Kawhi
Leonard. In the 2017 season, the superstars were LeBron James, Kevin Durant, Anthony Davis,
Stephan Curry, James Harden, Chris Paul, Russell Westbrook, Kawhi Leonard, and Paul George.
Besides having the number of stars in the game, the number of stars actually playing in the game
was also collected. Superstar players might miss the game due to injury, personal reason, and
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team decision. It would be meaningful to see that how attendance changes in response to the
absence of superstars.
Another important variable was the team performance. In the NBA, whether a team could
make playoffs is an important criterion determining the performance of a team. In this study, the
team played in the current season playoffs was viewed as a high-level team. In order to quantify
the quality of the team, the study collected pre-game Elo ratings (measurement of team quality)
for both teams in the game.
Considering the market size and stadium capacity are different for each team, this
research used the proportion to measure attendance. For example, if a stadium capacity is 20,000
seats, and there are 18,000 audiences in this game, the attendance would be 18,000/20,000,
which is 90%.
The attendance data of those teams with high standard deviations was analyzed
particularly because there were many teams with high attendance percentage every game in the
NBA, so it would be difficult to examine the impact of star power and team quality on the teams
with low standard deviations. This research wanted to provide team managers with business
insights of the impact on attendance and how to seize the opportunity, so the results of this
research would be more valuable for the teams with high standard deviations. Based on the
attendance data, Philadelphia 76ers, Milwaukee Bucks, Washington Wizards, Atlanta Hawks,
Minnesota Timberwolves and Denver Nuggets were teams with high attendance standard
deviations (&gt;.10).
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Methodology
Data Collection
There was not any existing dataset of NBA attendance, but all attendance data and
schedule could be obtained from basketball-reference.com and ESPN. The dataset of this
research was created by recording all attendance data of each team and which team they played
against in the past two seasons (2016 and 2017). There were 2459 games in the dataset with 28
data points of each game. Besides the attendance data, the dataset included the date and the day
of week to determine the influence brought by weekdays and weekends, and game time was also
collected in the dataset for the same reason. Each stadium may hold different sports games, so
the full capacity of the stadium was determined by the maximum attendance number of that
season. After having the attendance percentage of each game, the average attendance and
standard deviation were calculated for each team.
Another important part of the dataset was the quality of the team. All teams were divided
into two groups. The teams which played current season’s playoffs were high-level teams, and
the teams which didn’t make playoffs were low-level teams. Elo ratings were acquired from
FiveThirtyEight. The difference and average of Elo ratings were calculated to determine the
quality of the game.
The number of stars was collected separately for the home team and away team. The
number of stars who attended the game was also collected separately. The total number of stars
was calculated by adding the number of home team stars and away team stars. In addition, there
was a note column recording the status of players when they didn’t play in that game for further
research.
Data Analysis
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The descriptive analysis was conducted on the broad level by making tables and graphs in
different scenarios. The purpose this step was to see the difference in attendance based on the
number of superstars and the quality of the team. First, this research examined the relationship
between attendance and the total number of superstars in one game. Second, this research
conducted an analysis of attendance difference of playoff teams and non-playoff teams when
their opponents add superstars. Next, the attendance difference of teams with high attendance
variability was analyzed in this study. The first analysis was about attendance difference of
teams with high attendance variability when away team adds a superstar. The second analysis
was about attendance difference of teams with high attendance variability against playoff teams
and non-playoff teams. The last analysis was the attendance difference of teams with high
attendance variability versus the different number of away superstar.
After descriptive analysis, several regression models were built. In order to decrease the
impact of other factors on attendance, this research chose to use the day of week and game time
as control variables. After running a regression model of day of week and game time, it turned
out that only Friday, Saturday, and Sunday have a significant impact on attendance, and game
time doesn’t have statistically significant difference (Appendix A), so this research defined
Friday, Saturday, and Sunday as control variable-weekend and chose to leave game time since it
doesn’t show any significant difference.
The first regression model was built to test the relationship between attendance
percentage and the away superstar. The second regression model was built to examine the
relationship between attendance percentage and team quality including away playoff teams and
Elo rating of away team. The third regression model was based on four separate groups: the
high-level team (playoff team) with at least one superstar, the high-level team with no superstars,
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the low-level team (non-playoff team) with at least one superstar, and the low-level team with no
superstars. The purpose of this regression model was to analyze the relationship between
attendance percentage and different combinations of superstar and team quality. The regression
equation was:
Attendance Percentage = β0 + β1Weekend + β2Away Playoff &amp; Superstar + β3Away Playoff &amp;
No Superstar + β4No Playoff &amp; Superstar + e
In order to show the impact of star power and team quality on attendance prominently, all
regression models were tested twice. The first time was tested on all NBA teams, and the second
time was only tested on teams with high attendance variability.
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Results
Descriptive Analysis
Graph 1: Attendance Difference versus Number of Superstars
The average attendance is 89% when there is no superstar in a game. The average
attendance increases to 93% when a game adds one superstar. The average attendance
keeps increasing when a game adds more superstars.
Table 1: Attendance Difference of Playoff Teams(1)/Non-Playoff Teams(0) when
Away Team Adds Superstar
For the home team which is not a playoff team, the average attendance is 87.26%
when the away team has no superstars. The average attendance increases to 90.37% when
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the away team has one superstar, and the average attendance increases to 91.81% when
the away team has two superstars. For the home team which is a playoff team, the
average attendance is 94.22% when the away team has no superstars. The average
attendance increases to 96.23% when the away team has one superstar, and the average
attendance increases to 97.30% when the away team has two superstars.
Table 2: Attendance Difference of Teams with High Attendance Variability when
Away Team Adds Superstar
For teams with high attendance variability, the average attendance is 77.74% when
the away team has no superstars, and the average attendance increases to 82.86% when
the away team has one superstar. The average attendance increases to 84.52% when the
away team has two superstars.
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Graph 2: Attendance Difference of Teams with High Attendance Variability against
Playoff Teams(1)/Non-Playoff Teams(0)
For teams with high attendance variability, the average attendance increases when
they play against the playoff team.
Graph 3: Attendance Difference of Teams with High Attendance Variability versus
Number of Away Superstar
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For the most teams with high attendance variability, the attendance percentage
increases when the away team adds more superstars.
Regression Model
Table 3: Relationship between Attendance Percentage and Away Superstar
The away superstar has a significant impact on attendance. A visiting superstar will
increase attendance by 2.19%.
Table 4: Relationship between Attendance Percentage and Away Playoff Team
The away playoff team has a significant impact on attendance. A playoff team that comes
to town will increase attendance by 1.07%.
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Table 5: Relationship between Attendance Percentage and Elo Rating of the Away Team
Elo rating of the away team has a significant impact on attendance. Attendance
percentage will increase 0.89% when Elo rating of the away team increases by 100.
Table 6: Relationship between Attendance Percentage of Teams with High
Attendance Variability and Away Superstar
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Table 7: Relationship between Attendance Percentage of Teams with High
Attendance Variability and Away Playoff Team
For teams with high attendance variability, the effect is even larger. A visiting
superstar will increase attendance by 3.89%. A visiting playoff team will increase
attendance by 3.42%.
Table 8: Relationship between Attendance Percentage of Different Groups
In four different groups, the away playoff team with at least one superstar has a
significant impact on attendance. The attendance percentage will increase 2.85% when a
playoff team with at least one superstar comes to town comparing to a non-playoff team
with no superstars. The non-playoff team with one superstar also drives attendance, but
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the impact is not significant since there is only one team in the league meeting this
criterion.
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Discussion
From the results of descriptive analysis and regression models, this research
examined the hypothesis that star power and team quality have a significant impact on
attendance. After comparing the impact brought by star power and team quality, it’s
obvious that the star power drives more audience to the stadium. Admittedly, the
importance and value of team quality can’t be ignored, but NBA fans tend to be attracted
more by the away team’s superstar. Everyone wants to see LeBron James, Kevin Durant,
and Stephen Curry play on the court, but they don’t have enough motivation to buy
tickets when teams like Portland Blazers and Atlanta Hawks come to town, even though
both of them are playoff teams and have stars in their teams.
For those teams with high attendance variability, the results were more apparent.
People in cities like Atlanta, Milwaukee, and Minnesota are more likely to buy tickets
when a superstar comes to town. None of the teams with high attendance variability has a
superstar in their teams. On the other hand, it proves that people would like to watch a
superstar play in a game, so they buy tickets to see the away team’s superstar. Team
managers of the teams with high attendance variability should be aware that there will be
a big jump when the away team is a good team or the away team has a superstar. Team
managers should make specific and targeted marketing strategies to seize the opportunity.
For example, team managers can contact more advertisers because they know there will
be more audience in the stadium, so the effect of advertisements will be better. Another
example would be to change ticket price based on their opponents. Team managers may
increase ticket price when they play against a good team or a team with superstar because
fans are willing to pay more to see a good team and a superstar.
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For the NBA league and all teams in the league, this research suggested that a
superstar attracts more audience than a good team, so they should put more effort in
popularizing their stars. There are lots of good players in the NBA, but not all of them are
regarded as superstars. If the NBA league and teams can promote more stars and bring
them to a higher stage, more people will buy tickets to watch them play. Higher
attendance means higher ticket sales and total revenue for the NBA and teams.
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Limitations and Further Research
There are some limitations in this research. First, the star power and team quality are
highly correlated, so it’s hard to distinguish the impact brought by the star power and
good team. 9 out of 10 superstars in this research are in a playoff team, so the relationship
between attendance and good teams are hard to analyze because there is no good way to
control team quality without superstars. This research tried to control team quality and
superstars by dividing all teams into 4 different groups. However, another limitation was
that there was only one team in the group-the low-level team with at least one superstar,
so the sample size was too small to analyze. Second, the list of superstars came from two
professional sports media, but many people may disagree with the definition of the
superstar in this research, so it would be better if there is an objective definition of the
superstar. In addition, this research tried to use Elo ratings to quantify the team quality,
but sometimes it didn’t work very well.
For further research, this research used the day of week as the control variable. In the
future, more control variables could be added in the regression model, so the impact of
star power and team quality may be more significant. Moreover, in the 2016 season,
Kobe Bryant announced his retirement decision, so people went crazy when Lakers
comes to town since many basketball fans wanted to see Kobe’s last performance. It was
a particular case, and it would be interesting to see the comparison between the impact of
a current superstar and the impact of an aging superstar. Another direction of further
research could be the test of the impact brought by the number of superstars and the
number of superstars who actually played in the game. This research didn’t find any
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significant difference between the number of superstars and the number of superstars who
actually played, but the test could be done more specifically.
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Appendix
Appendix A: Relationship between Attendance Percentage and the Day of Week
and Game Time
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